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參數(shù)資料
| 型號(hào)： | VPC3200A |
| 廠商： | MICRONAS SEMICONDUCTOR HOLDING AG |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | Comb Filter Video Processor |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP80 |
| 封裝： | PLASTIC, QFP-80 |
| 文件頁數(shù)： | 10/78頁 |
| 文件大?。?/td> | 1245K |
| 代理商： | VPC3200A |
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VPC 323xD, VPC 324xD
ADVANCE INFORMATION
10
Micronas
2.3.1. IF-Compensation
With off-air or mistuned reception, any attenuation at
higher frequencies or asymmetry around the color
subcarrier is compensated. Four different settings of
the IF-compensation are possible (see Fig. 2–3):
– flat (no compensation)
– 6 dB/octave
– 12 dB/octave
– 10 dB/MHz
The last setting gives a very large boost to high fre-
quencies. It is provided for SECAM signals that are
decoded using a SAW filter specified originally for the
PAL standard.
Fig. 2–3:
Frequency response of chroma IF-com-
pensation
2.3.2. Demodulator
The entire signal (which might still contain luma) is
quadrature-mixed to the baseband. The mixing fre-
quency is equal to the subcarrier for PAL and NTSC,
thus achieving the chroma demodulation. For SECAM,
the mixing frequency is 4.286 MHz giving the quadra-
ture baseband components of the FM modulated
chroma. After the mixer, a lowpass filter selects the
chroma components; a downsampling stage converts
the color difference signals to a multiplexed half rate
data stream.
The subcarrier frequency in the demodulator is gener-
ated by direct digital synthesis; therefore, substan-
dards such as PAL 3.58 or NTSC 4.43 can also be
demodulated.
2.3.3. Chrominance Filter
The demodulation is followed by a lowpass filter for the
color difference signals for PAL/NTSC. SECAM re-
quires a modified lowpass function with bell-filter char-
acteristic. At the output of the lowpass filter, all luma
information is eliminated.
The lowpass filters are calculated in time multiplex for
the two color signals. Three bandwidth settings (nar-
row, normal, broad) are available for each standard
(see Fig. 2–5). For PAL/NTSC, a wide band chroma fil-
ter can be selected. This filter is intended for high
bandwidth chroma signals, e.g. a nonstandard wide
bandwidth S-VHS signal.
Fig. 2–4:
Color decoder
MHz
dB
ColorPLL/ColorACC
1 H Delay
M
M
CrossSwitch
Notch
Filter
Luma / CVBS
Luma
Chroma
MIXER
Lowpass Filter
Phase/Freq
Demodulator
ACC
Chroma
IF Compensation
DC-Reject
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| VPC3200APSGP | 制造商:MICRONAS 功能描述:New |
| VPC3201A | 制造商:MICRONAS 制造商全稱:MICRONAS 功能描述:Comb Filter Video Processor |
| VPC3205C | 制造商:MICRONAS 制造商全稱:MICRONAS 功能描述:Comb Filter Video Processor |
| VPC3210A | 制造商:MICRONAS 制造商全稱:MICRONAS 功能描述:Comb Filter Video Processor |
| VPC3210B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Consumer IC |
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